🔑 T104 — Get AES Session Key

Requests a fresh AES key from URA and saves it to the database for use by all other modules.

Current Session
⚠️ No active session in database. Run T104 below to get one.
Run T104

Connects to URA EFRIS, exchanges RSA keys, and retrieves the AES session key. The key is stored in efris_sessions table and used by all subsequent requests.